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3.11. Micro ‐ B USB Device Connector (J3)
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The ? micro ‐ B ? USB ? connector ? is ? connected ? to ? the ? USB ? OTG ? PHY ? on ? the ? i.MX53 ? Processer, ? and ? is ? also ?
connected ? to ? the ? Lower ? USB ? Host ? Jack ? on ? the ? connector ? tower. ? The ? connector’s ? external ? USB ? 5V ? power ?
pin ? is ? connected ? to ? the ? USB_OTG_ID ? pin, ? which ? is ? normally ? pulled ? to ? ground ? via ? a ? 3.3K ? Ohm ? resistor. ?
When ? a ? powered ? USB ? Host ? device ? is ? attached ? to ? the ? micro ‐ B ? USB ? connector, ? the ? USB_OTG_ID ? pin ? is ?
pulled ? high ? and ? sends ? a ? signal ? to ? the ? USB ? OTG ? PHY ? to ? operate ? in ? device ? mode. ?? The ? connector’s ? external ?
USB ? 5V ? power ? pin ? is ? not ? connected ? to ? the ? PMIC, ? or ? any ? other ? power ? rails ? on ? the ? Quick ? Start ? board. ?
Therefore, ? it ? is ? not ? possible ? to ? supply ? power ? to ? the ? Quick ? Start ? board ? via ? the ? USB ? connections. ?
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3.12. Audio Input/Output (J6/J18)
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Analog ? audio ? input ? and ? output ? are ? provided ? by ? Freescale’s ? Low ? Power ? Stereo ? Codec, ? SGTL5000. ? The ?
audio ? codec ? is ? connected ? to ? the ? i.MX53 ? Applications ? Processor ? via ? 4 ‐ wire ? I2S ? communications, ? utilizing ?
the ? AUDMUX5 ? port ? of ? the ? processor. ? The ? audio ? codec’s ? Headphone ? Amp ? provides ? up ? to ? 58 ? mW ? output ?
to ? 16 ‐ Ohm ? headphones ? at ? a ? typical ? SNR ? of ? 98 ? dB ? and ? THD+N ? of ?‐ 86 ? dB. ? Typical ? power ? consumption ? is ?
11.6 ? mW. ? In ? addition, ? the ? audio ? codec ? can ? perform ? several ? enhancements ? to ? the ? output ? including ? virtual ?
surround, ? added ? bass ? and ? three ? different ? types ? of ? equalization. ? The ? Microphone ? Input ? module ? of ? the ?
Stereo ? Codec ? is ? also ? used, ? with ? the ? microphone ? input ? connected ? to ? the ? tip ? pin ? of ? the ? Microphone ? Jack ?
(J6). ? Microphone ? Bias ? voltage ? is ? applied ? on ? the ? Quick ? Start ? board ? and ? not ? as ? a ? separate ? connection ? to ?
the ? Microphone ? Jack. ? If ? the ? user ? desires ? to ? use ? a ? combined ? microphone, ? mono ? headphone ? device, ? the ?
ferrite ? bead ? on ? L25 ? can ? be ? moved ? to ? the ? L22 ? pads, ? redirecting ? the ? right ? channel ? output ? to ? the ?
Microphone ? Jack. ? A ? 2.5mm ? to ? 3.5mm ? adapter ? may ? be ? necessary ? to ? convert ? the ? microphone, ? mono ?
headphone ? device ? to ? fit ? the ? Microphone ? Jack. ? On ? both ? the ? Headphone ? Jack ? and ? Microphone ? jack, ? a ?
fourth ? pin ? is ? used ? to ? detect ? the ? insertion ? of ? a ? plug ? into ? either ? jack. ? When ? a ? standard ? 3 ‐ pin ? device ? is ?
inserted ? into ? the ? 4 ‐ pin ? jack, ? the ? detect ? line ? is ? grounded, ? indicating ? to ? the ? i.MX53 ? Processor ? that ? the ? plug ?
has ? been ? inserted. ?
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3.13. 5V Power Connector (J1)
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A ? 2.0mm ? x ? 6.5mm ? barrel ? connector ? is ? used ? which ? should ? fit ? standard ? DC ? Plugs ? with ? an ? inner ? dimension ?
of ? 2.1mm ? and ? an ? outer ? dimension ? of ? 5.5mm. ? If ? an ? alternate ? power ? supply ? is ? used ? (not ? the ? original, ?
supplied ? power ? supply), ? it ? should ? supply ? no ? more ? than ? 5.25V ? / ? 3A ? output. ? If ? the ? PMIC ? senses ? too ? high ?
voltage ? at ? the ? connector ? input, ? it ? will ? turn ? off ? isolation ? FET ? Q1 ? to ? protect ? the ? Quick ? Start ? board. ? In ?
between ? the ? Power ? Connector ? and ? the ? isolation ? FET ? is ? a ? single ? blow, ? fast ? acting ? fuse ? to ? protect ? the ?
Quick ? Start ? board ? from ? an ? over ? current ? situation ? fault. ? If ? a ? Wall ? Power ? Supply ? is ? properly ? connected ? to ?
the ? Quick ? Start ? board, ? and ? the ? green ? 5V ? power ? LED ? indicator ? is ? not ? lit, ? it ? could ? mean ? that ? either ? the ? fuse ?
has ? been ? blown, ? or ? that ? the ? voltage ? output ? of ? the ? power ? supply ? is ? too ? high. ?
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Freescale Semiconductor
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
10
PUBI – Public Use Business Information ?
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